W1KOO - Mt. Mansfield, Vermont :

(Up dated 12/10) The Burlington Amateur radio Club (BARC) has operated repeaters stations on Mt. Mansfield for many years. The equipment is presently located in the area designated for communications use in a building owned by Vermont Educational Television (ETV) now called Vermont Public Television (VPT). This building is located in the South end of the "nose" of the mountain. If you look at the profile of the mountain from a far distance it looks like the side view of a face looking skyward. The "nose" is the high point to the south. The "chin" is to the north. At 4393 ft, is the highest point on the mountain and the highest mountain point in the State.

In 2003 a joint effort by BARC, NFMRA and W1IMD was undertaken to up grade the old UHF system which had been in operation there for several years with newer equipment and attempt to bring the system up to a good operating condition. Because of the intense radiation (RFI) and inter-mod (IMD) created by all the TV, FM and other communication transmitters located in the immediate area, it was not an easy task to make each repeater station work well. But time and patience by W1IMD prevailed and the system now operates very well. The equipment in use at this site is a Motorola MSF-5000 which operates on a frequency of 447.175 / 442.175. CTCSS tones are required to access the repeater, 82.5 Hz. for local operation ( the link is not keyed up in this mode) and 71.9 HZ. was required to link into the MT. Washington system. The MT. Washington link is no longer in use. (See below)

Starting around 2006 +/- a major consolidation of all the communications equipment on the mountain top took place. All the equipment located elseware on the Mountain, except that belonging to the State of Vermont, was moved to the area where Channel 3 and Channel 33 facilitieshad been located for several years. The transition from analog to a digital TV format necessitated making building renovation, removing and replacing transmitters, towers, antennas and etc., which in turn required moving the amateur antennas and equipment from place to place as renovations progressed. When a permanent place has been agreed upon for the antennas and equipment, the final objective for this station, we hope, will be achieved.

In July 2010 the "dust" had almost completely settled. In the Summer of 2009 a Motorola Quindar VHF repeater replaced the old GE Masta II repeater. Both the VHF and MS-5000 UHF stations were located in the same enclosure. Amateur antenna locations were still up in the air but in July,10 a temporay location was agreed to. Although not the best location, both the VHF and UHF repeaters are now back in operation. The UHF repeater no longer connects to the Mt. Washington system but is now linked into the NFMRA Mt. Killington system. The repeater will operate in two modes, local mode where in the repeater does not key the link transmitter. A CTCSS tone of 82.5 Hz.is required for local mode. To link into the NFMRA system a CTCSS tone of 110.9 Hz. must be used. At this time antenna locations are still not finalized. Coverage from the present antenna locations are relativly good but a better location is still being concidered.

 

Mount Mansfield Ham Radio Station

 

<--- In the picture to the left located on the shelf behind the cable tray is the duplexer for the two meter repeater. This duplexer, was made by EMR Corp. It is composed of six cavity with dual junction isolaters.

 

 

 

<---Location of the VHF Motorola Quintar repeater.

 

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<--- UHF Duplexer

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<--- Motorola MSF 5000 UHF power amp.

<--- Transmitter P A filter.

<--- Pacific Research repeater controller.

<--- Mororola MSF 5000 link repeater RF tray and PA.

 

 

Here is a closer view of the cabinet containig the VHF, UHF and link equipment

 

The Motorola VHF Quindar repeater. --->

 

 

 

 

 

 

 

 

 

 

 

 

 

Mount Mansfield Ham Radio Station
Mount Mansfiel Ham Radio Antenna

This picture shows both of the VHF and HUF repeater antennas.

 

 

<--- The VHF repeater antenna is a Cellwave BA1010 with 0 Db gain .

 

 

<--- The UHF repeater antenna is a DB Products 303 and has 3 Db of gain.

 

 

The link antenna was not in place when this picture was taken.

 

This winter picture will give you an idea of the rime ice that can build up on an antenna and thi is mild compaired to what it could be. As in the picture above, the top antenna is the VHF repeater antenna.

The UHF antenna is hard to locate as from the angle this picture was shot it is directly in line with the support mast.

The five element link antenna that is a not shown in the above picture is visable here. Its make and model are not known.

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